Name Entity Recognition in NLP

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Introduction To Name Entity Recognition in NLP

The goal of Name Entity Recognition in NLP, or NER, is to detect and label these nouns with the real-world concepts that they represent. But NER systems aren’t just doing a simple dictionary lookup. Instead, they are using the context of how a word appears in the sentence and a statistical model to guess which type of noun a word represents. Named entities are definite noun phrases that refer to specific types of individuals, such as organizations, persons, date and time, product names, amount of money, and so on. 

NER has tons of uses since it makes it so easy to grab structured data out of text. It’s one of the easiest ways to quickly get value out of an NLP pipeline.

NE TypeExamples
ORGANIZATIONGeorgia-Pacific Corp., WHO
PERSONMahatma Gandhi
LOCATIONSewagram, Wardha
TIME5.00 AM IST
DATEOctober 2, 2020 
MONEY1 million
PERCENT78%
FACILITYWashington Monument, Stonehenge
GPEsoutheast Asia, Midlothian

Tutorial

NLTK provides a classifier that has already been trained to recognize named entities, accessed with the function nltk.ne_chunk(). If we set the parameter binary=True, then named entities are just tagged as NE; otherwise, the classifier adds category labels such as PERSON, ORGANIZATION, and GPE.

sent = nltk.corpus.treebank.tagged_sents()[22]
print(nltk.ne_chunk(sent, binary=True)) 
output:
(S
  The/DT
  (NE U.S./NNP)
  is/VBZ
  one/CD
  ...
  according/VBG
  to/TO
  (NE Brooke/NNP T./NNP Mossman/NNP)
  ...)

Conclusion

In this article, we are learning about the importance of words based on entity recognition. Most of the time same word having as same meaning so they reduce with the help of name entity recognition.

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